ACDelco Engine Coolant Temperature Indicator Switch 213-4792 (88865045) — Gold OE Fit, Accurate Temp Sensing

This ACDelco Gold switch is engineered to match General Motors' factory specifications for fit, function, and durability. It replaces the original coolant temperature sensing switch used to inform the vehicle’s ignition and engine fuel-management systems, helping the engine control module and instrument cluster receive accurate temperature signals. Built to GM OE standards, the part aims to deliver dependable operation and a service life consistent with the vehicle’s original components.

How does this temperature switch affect engine performance?

The coolant temperature indicator switch provides a critical input to the engine’s management systems; accurate temperature data helps the ECM and ignition components adjust fuel mixture and timing. When the switch operates correctly, the vehicle maintains intended idle behavior, emissions control, and starting performance across temperature ranges. A faulty switch can cause incorrect sensor readings that may trigger diagnostic codes or affect drivability.

• Restores reliable temperature signal to ECU and dash indicators
• Helps maintain intended cold-start fueling and ignition timing
• Reduces risk of drivability issues tied to erroneous temperature data

Will this ACDelco Gold part fit my GM vehicle?

This component is a GM-recommended replacement for the vehicles that originally used the specified OE switch. Fitment depends on your vehicle’s year, make, model, and engine variant—always verify part numbers against your VIN or vehicle application. The ACDelco Gold line is manufactured to match the original factory part’s dimensions and electrical connections for a seamless substitution.

• Matches GM OE specification for correct fit and connector type
• Check compatibility with your VIN or OEM part number list
• Designed to replace the factory-installed temperature switch directly

How simple is installation, and what should a DIYer know?

Installation is typically straightforward for someone comfortable with basic automotive work: drain enough coolant to access the switch, unplug the electrical connector, remove the old switch, and install the new unit with the appropriate thread sealant or washer. Torque to the vehicle manufacturer’s specification and refill coolant, then test for leaks and proper signal operation. If you’re unsure, a trained technician can complete the job quickly.

• Basic hand tools required; follow torque and sealing recommendations
• Draining a small amount of coolant usually necessary to prevent spillage
• Verify electrical connection and absence of leaks after installation

How can I tell if the temperature switch needs replacement?

Common indications include erratic temperature gauge readings, persistent engine trouble codes related to coolant temp sensors, rough idle on warm or cold starts, or fans that fail to activate when expected. Use a scan tool to monitor temperature sensor inputs and check for freeze-frame data; continuity or resistance testing of the switch can confirm failure. Symptoms tied to multiple systems often point to this switch as a logical diagnostic check.

• Erratic or stuck temperature gauge readings on the dash
• Illuminated engine light with coolant temperature-related codes
• Cooling fan or idle control irregularities linked to temp input

Who is this part for? If you own a GM vehicle that originally used this coolant temperature indicator switch and you want a direct, factory-spec replacement, the ACDelco Gold 213-4792 (88865045) is designed for you. It’s suited to professional technicians, DIY mechanics, and fleet maintenance teams who prioritize OEM-level fit, reliability, and lifespan. Choose this Gold series switch when you need a dependable, GM-recommended replacement that aligns with the vehicle’s original engineering.